This adds the initImage field to the custom resource definition
and takes it into use.
The fpga webhook image validation function is split off into a
separate file.
Signed-off-by: Ukri Niemimuukko <ukri.niemimuukko@intel.com>
this commits also changes validatePluginImage() to allow
image version as a parameter so that it can be used by by
other webooks too.
Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>